Davit for ships&#39; boats and similar purposes.



E. L..M. SIVARD DAVIT FOR SHIPS BOATS AND SIMILAR PURPOSES.

APPLIOATIQN FILED AUG. 9. 1909.

Patented Apr. 26, 1910.

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- Arm/m E. L. M. SIVARD.

DAVIT FOR SHIPS BOATS AND SIMILAR PURPOSES.

APPLICATION FILED AUG. 9. 1909.

Patented Apr. 26, 1910.

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UNITED STATES PATENT oriuon.

EINAR L. M. SIVARD, OF NEW YORK, N. Y., ASSIGNOR TO WELIN DAVIT AND LANE80 DE GROOT COMPANY, CONSOLIDATED, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Apr. 26, 1910.

Application filed August 9, 1909. Serial No. 512,064.

To all whom it may concern:

Be it known that I, EINAR L. M. SIVARD, a subject of the King of Sweden,and residing in the borough of Brooklyn, city of New York, county ofKings, and State of New York, have invented certain new and usefulImprovements in Davits for Ships Boats and Similar Purposes, of whichthe following is a full, clear, and exact descrip tion.

My invention relates to improvements in davits for ships boats andsimilar purposes.

In the accompanying drawings, 1n which similar reference charactersdesignate corresponding parts throughout, I have illustrated a preferredform of my invention.

In these drawings, Figure l is a side elevation; Fig. 2 is an endelevation; and Figs. 8 and 4 are detailed views.

Referring now to these drawings, A designates a boat or other load whichit is desired to swing in and out or backward and forward. In the caseof a boat, it will also be desirable, when the same is in place upon thedeck of a vessel, to raise the same slightly at the commencement of theoperation to clear it from the chocks.

B designates a davit or davit arm. As shown, the davit arm has a doubleor split lower portion, composed of two portions B B As shown, theportion B is cast integral with the arm proper B whereas the portion Bis cast separate therefrom and has its upper end secured to the arm Beither by riveting, welding or in any other suitable manner, or theparts in question may be cast integral. If desired, the part B might bemade of precisely the same configuration as the integral structure B Band the two arts either riveted or welded together to glve additionalstrength.

0 G designate two pivots for pivotally securing the lower ends B B tothe deck or other suitable support. As shown, these pivots C 0 connectthe lower ends B B to upwardly extending lugs of the base plate D whichmay be secured to the deck or other support in any suitable manner, suchas by bolts.

E designates a casting having the base plate D for securing it to thedeck or other suitable support and an upwardly extending portionprovided with a flange e for supporting the operating mechanism and thecasing therefor. In Fig. l, the upper boundary of this casting isindicated in dotted lines. The preferred shape thereof is indicated inFig. 4. Any other suitable support for these operating devices may beutilized.

G designates my preferred form of operating rod which, as shown best inFig. 2, comprises two outside plates 9 g bound together by spaced pins9. As shown, this operatin rod is curved to form the segment of a circ ehaving the point C as the center and the distance from C to theoperative position of the operating rod G as its radius. The pins 9 ofthe operating rod Gr engage with and are driven in each direction by theteeth of a sprocket wheel K mounted on a shaft M, which shaft is shownas journaled in the upper end of the casting E. This same shaft M, asshown in Fig. 3, extends within the casing T, which may either form partof the casting E or may be mounted thereon and which will preferably beprovided to'inclose certain operating parts which, as shown, in thedrawings, comprise the worm P and the worm wheel N. The worm wheel N isshown as keyed to the same shaft M to which is rigidly secured thesprocket wheel K. The worm P which engages the worm wheel N and drivesthe same in either direction is mounted on a separate shaft 9 journaledin the casing T and projecting at one end beyond the same to permit thesecuring thereto of a driving device which is shown as a manuallyoperated handle Q. Obviously a motor of any suitable type might besubstituted as a driving power. The operating rod G is pivotally securedat any suitable point, such as at H, to the davit arm. Preferably itwill be secured at or about the junction of the two lower portions B Bthereof.

S designates a roller mounted on a projection 15 of the casing T. Asindicated in dotted lines in Fig. 2, the roller is secured to theprojection by means of a bolt. This roller is so situated as to bearagainst the outer edge of the operating rod G and its connected sprocketchain J, while the parts are in operation, to keep the same in operativeposition or in engagement with the teethv of the sprocket wheel K. Thesprocket chain J may be a flexible sprocket chain of ordinary characterpivotally connected at the point j to the lower end of the operating arG and pivotally connected at its other end at a point j to the castingor support E. This latter end may be secured at any desirable point toany desirable portion of the vessel or other structure upon which thedavit is mounted.

The operation of the illustrated apparatus is as follows: Assuming theparts to be in the position indicated in Fig. 1 in full lines, thehandle Q is turned, thus driving the worm P, which actuates the wormwheel N, thus rotating the shaft M and the sprocket wheel K which iskeyed or otherwise rigidly secured thereto. The teeth of the sprocketwheel being in engagement with the pins g of the operating rod Gr forcesthe same upward and around the circumference of a circle of which G isthe center. This in turn forces the davit-arm B to swing outward untilthe lower end of the operating rod is reached. This operating rod shouldbe of suflicient length to force the davit arm B sufficiently far beyonda central position to prevent the possibility of the same swinging backeven in rough water when the boat is rolling. The precise distancebeyond the center to which it will be necessary to push the davit armwill naturally depend upon the conditions under which the apparatus isto be used. If on land, the slightest distance beyond the center will besufficient. If for use in smooth water, a very slight distance beyondthe center will suffice. If for use in rough water, where the vessel isapt to roll heavily, it may be necessary to make the operating arm Glong enough to force the davit arm considerably beyond its centralposition. The operating arm G, having forced the davit arm to the end ofits predetermined extent of movement, the sprocket wheel continues torotate and engage the links of the sprocket chain J. The engagementbetween the sprocket wheel and the sprocket chain acts, not as anoperating or pushing device, but rather as a restraining device toprevent the boat and davit arm from moving too rapidly outboard.Preferably, of course, the worm and worm wheel will engage at such apitch as to remain in a locked condition, excepting when driven bymanual or other power. The shaft is now rotated until the davit arm andboat reach the desired outboard position, such as indicated in dottedlines in Fig. 1. Obviously, the sprocket chain J may be of any suitablelength to meet the conditions under which the apparatus is to beoperated. To return the davit arm to the position shown in heavy linesin Fig. 1, the shaft 79 is rotated in the opposite direction, thusdriving the sprocket wheel in the opposite direction which first takesup the flexible chain J and subsequently engages the pins 9 on theoperating arm G to pull back the davit arm and boat or other objectcarried thereby to its original position. In all these operations, theroller S is bearing against the outer edge of the operating arm andflexible sprocket chain to keep the same in engagement with the teeth ofthe sprocket wheel K.

If the device to be handled is a boat, it will probably be mounted inchocks, and in order to swing the same outboard, it is necessary toraise the same slightly so as to clear the chocks before orsimultaneously with the commencement of the outboard the pivot C at anappreciable distance from movement. For this purpose, I have shown thecenter a of the boat to be handled. In any event, whether the apparatusis used on land or on a vessel, and whether it is intended to handleboats or other articles, it is preferable to have the pivotal points Cso arranged as to be an appreciable distance outside of the verticalplane passing through the center of the device which may be handled.This will insure a slight upward movement of the outer end of the davitarm and the consequent raising of the device to be handled which occurssimultaneously with the commencement of the outboard movement of thesaid outer end.

Any other suitable operating mechanism for operating the sprocket wheelmay be employed and any other suitable means of moving the operating armand flexible connection between it and the structure backward andforward may be substituted for the sprocket wheel. Furthermore, insteadof having two separate pivots C C, one for each of the lower portions BB of the davit, a common pivot, such as a common shaft, may besubstituted.

What I claim is:

1. A davit arm pivoted at its lower end to swing, a rigid operating rodconnected at one end to said davit arm, a flexible connection pivotallyconnected at one end to the free end of the operating rod and at theother end to a rigid portion of the structure, and operating mechanismfor engaging with the operating rod and flexible connection.

2. A davit arm pivoted to swing, a rigid operating rod connected at oneend to said davit arm and shaped to form the arc of a circle having thepivotal point of the davit arm as its center, a flexible connectionpivotally connected at one end to the free end of the operating rod andat the other end to a rigid portion of the structure, and operatingmechanism for engaging with the operating rod and flexible connection.

3. The combination with a load, of a davit arm pivoted to swing at apoint outside the vertical plane passing through the center of the load,a curved rigid operating rod connected at one end to said davit arm, aflexible connection pivotally connected at one to the foregoingspecification in the presence end to the free end of the operating rodand of two subscribing Witnesses. at the other end to a rigid portion ofthe structure, and operating mechanism for en- EINAR SIVARD' gaging Withthe operating rod and flexible Witnesses: connection. J 0s. F. OBRIEN,

. In Witness whereof, I have signed my name R. V. FINN.

